EP0796832B1 - Process for the disposal of wet refuse - Google Patents

Process for the disposal of wet refuse Download PDF

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Publication number
EP0796832B1
EP0796832B1 EP97200781A EP97200781A EP0796832B1 EP 0796832 B1 EP0796832 B1 EP 0796832B1 EP 97200781 A EP97200781 A EP 97200781A EP 97200781 A EP97200781 A EP 97200781A EP 0796832 B1 EP0796832 B1 EP 0796832B1
Authority
EP
European Patent Office
Prior art keywords
refuse
turbo
wet
stream
dryer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97200781A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0796832A1 (en
Inventor
Corrado Vezzani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vomm Chemipharma SRL
Original Assignee
Vomm Chemipharma SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vomm Chemipharma SRL filed Critical Vomm Chemipharma SRL
Publication of EP0796832A1 publication Critical patent/EP0796832A1/en
Application granted granted Critical
Publication of EP0796832B1 publication Critical patent/EP0796832B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23K—FODDER
    • A23K10/00—Animal feeding-stuffs
    • A23K10/20—Animal feeding-stuffs from material of animal origin
    • A23K10/26—Animal feeding-stuffs from material of animal origin from waste material, e.g. feathers, bones or skin
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23K—FODDER
    • A23K10/00—Animal feeding-stuffs
    • A23K10/30—Animal feeding-stuffs from material of plant origin, e.g. roots, seeds or hay; from material of fungal origin, e.g. mushrooms
    • A23K10/37—Animal feeding-stuffs from material of plant origin, e.g. roots, seeds or hay; from material of fungal origin, e.g. mushrooms from waste material
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23K—FODDER
    • A23K40/00—Shaping or working-up of animal feeding-stuffs
    • A23K40/10—Shaping or working-up of animal feeding-stuffs by agglomeration; by granulation, e.g. making powders
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F9/00—Fertilisers from household or town refuse
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
    • Y02P60/87—Re-use of by-products of food processing for fodder production
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/38—Solid waste disposal

Definitions

  • the present invention relates, in its most general aspect, to the disposal of urban as well as industrial refuse.
  • this invention concerns a process for the industrial processing, on a large scale and with great capacity, of so-called wet refuse either of urban origin such as, for example and especially, food waste from catering establishments, canteens, communities and the like, or those originating from the food industry and the agrifoods industry.
  • the most widely used refuse disposal methods comprise those which have the object of transforming the refuse into fertilizer and are essentially based on so-called composting or refuse compost, a kind of anaerobic fermentation.
  • Such composting can be effected in a "natural" or industrial manner.
  • the first case involves storage of the discharged refuse with the formation of solid heaps which are covered with mould and in which, after a certain fermentation time, the organic parts are transformed into humus containing quantities of nitrogen, phosphorus and potassium which, although they are very low, allow this to be used as organic fertilizer.
  • the sites destined for the discharges are always large, must be appropriately equipped and prearranged for preventing, for example, pollution of subterranean water tables, require the employment of personnel and means of non-negligible importance and also always involve air pollution problems.
  • the industrial method involves subjecting the refuse to a preliminary sifting to remove metal parts and to separate out paper, rags, plastics, glass and the like.
  • the remainder is, after appropriate crushing, caused to ferment as in the case of natural fermentation with the respective disadvantages, or the fermentation is primed with suitable cultures in fermentation cells, rotary drums and the like.
  • the time taken for completion of the fermentation is in this case never less than 15-20 days.
  • DE-A- 2061574 describes a process for treating solid refuse, which includes selecting among the materials therein comprised the organic refuse and treating the latter, after being ground, with a stream of air at 100°C and finally granulating it.
  • EP-A- 0538653 discloses a machine for processing material in general by centrifuging and thermal treatment which includes a casing defining an internal processing chamber housing a rotor provided with blades, the casing being provided with means for heating its walls.
  • EP 0707 858 discloses a process in which hospital refuse is comminuted to a powder-like consistency or at least so as to be capable of being pumped and subsequently subjected to heat sterilisation treatment in a highly turbulent dynamic thin layer.
  • the problem which underlies the present invention is consequently that of providing a process which allows for disposal of wet refuse, in particular wet food refuse of the type defined above, to be effected on an industrial scale, while overcoming all the disadvantages at present recognized in the known techniques, that is to say a process which allows large quantities of wet refuse to be processed continuously and in a highly economical manner and which does not also involve problems of environmental pollution and which can be carried out with equipment and plant which require less space and are easy to operate and control.
  • granulation of the pasty and wet stream of cooked refuse is carried out simultaneously with the abovementioned drying phase, to give granules having a relative moisture content variable between 15% and 5%.
  • the heating of the said wet refuse is carried out, according to this invention, by arranging them in the state of a thin layer.
  • the thin layer it is advantageous and preferred to cause the thin layer to flow forward in substantial contact with a wall heated to a temperature at which the desired phases of pasteurization/sterilization and cooking can easily take place.
  • turbo-cooker In order to carry out this pasteurization/ sterilization and cooking phase of the process of the present invention on an industrial scale, it is advantageous to use equipment known by the name turbo-cooker.
  • This essentially comprises a tubular cylindrical body with a heated inner wall, a bladed rotor axially extending within the said tubular cylindrical body, the blades of which being arranged helically and having free ends which almost touch the heated wall.
  • one or more openings are provided for injecting the wet refuse stream, which is to be subjected to heat processing, and at least one opening is provided for discharging the pasty and wet continuous stream of cooked, pasteurized or sterilized refuse.
  • phase of drying (and, if appropriate, granulation) of the wet and pasty stream of cooked refuse is advantageously also carried out while maintaining the said stream in the state of a thin turbulent layer and causing the latter to flow forward in contact with a heated wall.
  • turbo-dryer/granulator equipment known by the name turbo-dryer/granulator is used for this phase of drying (and granulation).
  • This equipment is structurally identical to the turbo-cooker schematically described above.
  • the material to be processed which enters this equipment is immediately centrifuged by the respective rotor against the heated wall, continuously forming an annular thin layer which is constantly maintained in agitation and mixing by the blades of the said rotor.
  • the helical arrangement of the blades and their orientation are selected in such a way that they push the thin annular layer of material toward the discharge from the equipment, with the residence times preset as a function of the operating phases which it is intended to carry out, and of the "nature" of the material to be processed.
  • the process of this invention is characterized in that it comprises the phases of:
  • the product obtained constitutes an advantageous and effective supplement in animal nutrition.
  • the outgoing material can conveniently be used in agriculture.
  • the obtained product represents a convenient alternative fuel, thanks to its high calorific power.
  • Wet food refuse originating from canteens, communities and other similar catering establishments, collected in a storage silo/hopper 1, are passed by means of a conveyor 2 to a crushing/grinding station 3. During this transfer, the material is "freed" of any metal parts, located by a metal detector 4 which co-operates with a flow deflector 5 in order to direct the said metal parts to a receiving container 6.
  • the comminuted/ground wet refuse issuing from the station 3 is passed to a turbo-cooker 7.
  • the said turbo-cooker 7 is a machine which is known per se and will therefore not be described in detail. It essentially comprises a tubular cylindrical body 8, fitted with openings 9, 10 for the introduction of the material to be processed and for the discharge of the processed material.
  • a heating jacket 11 through which, for example, a heat transfer oil flows, serves to maintain the inner wall 8a of the cylindrical body 8 at a preset temperature.
  • an appropriately motorized, bladed rotor 12 is axially mounted, the blades of which are disposed according to a helical arrangement in order thus to push the material to be processed toward the discharge opening and to centrifuge it against the inner wall 8a so as to arrange it in a thin turbulent layer.
  • blades of the said rotor 12 can be oriented in various ways in order to vary the residence time of the material to be processed in the interior of the tubular cylindrical body 8.
  • the turbo-cooker 7 has an inner wall heated to a temperature of 160°C, while its bladed stirrer is set in rotation at a speed of 450 rpm.
  • the ground wet refuse fed into the latter is disposed in the form of a thin annular turbulent layer which is moved in contact with the hot wall to undergo homogeneous uniform heating up to a temperature of about 125-130°C (measured at the outlet from the turbo-cooker), which is a safe pasteurization/sterilization temperature.
  • the residence time in the interior of the turbo-cooker is 7 minutes, which has been found to be more than sufficient for the pasteurization/sterilization of the material (or at any rate for sanitizing it) as well as complete cooking thereof.
  • the pasty wet stream of cooked and pasteurized or sterilized refuse leaving the turbo-cooker 7 is collected in the tank/hopper 13 fitted with an extraction hood 14 for the vapours evolved during the cooking.
  • a continuous stream of the said wet, cooked and pasteurized (sanitized) refuse is fed into the inlet of a turbo-dryer 16 which is structurally similar to the turbo-cooker 7.
  • the inner wall of the said turbo-dryer 16 is heated to a temperature of 250°C, while its bladed rotor is set into rotation at a speed of 800 rpm.
  • a stream of heated air is fed into the said dryer 16 in cocurrent with the stream of material to be dried, to act as a fluid vector in order to remove, as quickly as possible, the water vapour which evolves continuously through the heat exchange of the material (wet and cooked refuse) with the hot wall of the turbo-dryer.
  • the air and vapour extracted from the latter as well as the dried (and granulated) product are passed continuously to a separator cyclone 17, from which the dried (and granulated) product with a relative moisture content of 15% is discharged through a rotary valve 18 and sent to a cooling unit 19.
  • the air/vapour mixture issuing from the top of cyclone 17, to which the stream of vapours extracted from the hood 14 is added, is fed into a scrubber unit 20 where scrubbing and precipitation of the pulverulent residues carried over by the said mixture take place.
  • a diathermic oil boiler 23 furnishes the heat required for the cooking and pasteurization/sterilization phase, for the drying/granulation phase and also for heating the air.
  • the dried granulated product issuing from the cooler 19 is passed to storage silos from which it can be taken to a conventional finishing line.
  • This product which has a balanced content of fibre, proteins, fats and sugars, can be validly used in fodder production, and, thanks to its good supply of C and N, can also be used in agriculture.
  • this ground and comminuted refuse was subjected to cooking in a turbo-cooker in which the wall temperature was controlled at values of 120-135°C, while the speed of the bladed rotor was controlled at values of 500-600 rpm.
  • the granules obtained could advantageously be used in fodder production even after a prolonged storage period.
  • the pasty stream leaving the said turbo-cooker had a temperature of 130°C and was fed at this temperature into a turbo-dryer/granulator whose wall temperature was controlled at values of 300°C, with the rotor run at 450 rpm.
  • the granules obtained could be used in fodder production even after prolonged storage periods.
  • the equipment is of reduced energy consumption; in fact, consumption of 3349.4 KJ/Litre (800 Kcal/litre) of water evaporated is assumed.
  • the closed-circuit processing system eliminates any type of impact on the environment and the only effluent is represented by condensate waters which can be directly discharged into watercourses.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Polymers & Plastics (AREA)
  • Zoology (AREA)
  • Food Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Animal Husbandry (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Biotechnology (AREA)
  • Physiology (AREA)
  • Biomedical Technology (AREA)
  • Mycology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Botany (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processing Of Solid Wastes (AREA)
  • Fodder In General (AREA)
  • Beans For Foods Or Fodder (AREA)
EP97200781A 1996-03-22 1997-03-14 Process for the disposal of wet refuse Expired - Lifetime EP0796832B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI960579 1996-03-22
IT96MI000579A IT1283297B1 (it) 1996-03-22 1996-03-22 Metodo per lo smaltimento di rifiuti umidi

Publications (2)

Publication Number Publication Date
EP0796832A1 EP0796832A1 (en) 1997-09-24
EP0796832B1 true EP0796832B1 (en) 2000-04-26

Family

ID=11373754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97200781A Expired - Lifetime EP0796832B1 (en) 1996-03-22 1997-03-14 Process for the disposal of wet refuse

Country Status (7)

Country Link
US (1) US5906793A (enrdf_load_stackoverflow)
EP (1) EP0796832B1 (enrdf_load_stackoverflow)
AT (1) ATE192129T1 (enrdf_load_stackoverflow)
CA (1) CA2200652C (enrdf_load_stackoverflow)
DE (1) DE69701761T2 (enrdf_load_stackoverflow)
ES (1) ES2147964T3 (enrdf_load_stackoverflow)
IT (1) IT1283297B1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2311884A1 (en) 2009-10-16 2011-04-20 Vommchemipharma S.R.L. Process for the production of cationic starch
US9981884B2 (en) * 2013-09-11 2018-05-29 Afyren Method for preserving the fermentable potential of an organic substrate and corresponding facility

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6039504A (en) * 1998-09-21 2000-03-21 Muscat; Armond Process and apparatus for the treatment of waste
US6135374A (en) * 1999-10-08 2000-10-24 Mursen Environmental, Inc. Food by-product processing apparatus
KR100331458B1 (ko) * 2000-03-17 2002-04-09 오세헌 음식물 쓰레기의 자동처리 및 사료제조장치
US9863705B2 (en) * 2003-03-06 2018-01-09 Vomm Chemipharma S.R.L. Process for drying finely divided organic substances capable of producing explosives reactions
US20050274035A1 (en) * 2004-06-04 2005-12-15 Wastech International, Inc. Waste handling system
US8017021B1 (en) * 2006-02-01 2011-09-13 Staples Wesley A Sludge processing apparatus and method
ITMI20061846A1 (it) * 2006-09-27 2008-03-28 Geoline Srl Sistema per la messa in sicurezza di impianti di essicamento di sostanze organiche suscettibili di causare reazioni eplosive e procedimento per l'essiccamento di dette sostanze
US20090300937A1 (en) * 2008-05-30 2009-12-10 Komline-Sanderson Engineering Corporation Indirect drying method using two temperature zones
ES2408114B1 (es) * 2011-08-12 2014-05-07 Ramón VENTOSA I PUYANE Procedimiento y sistema para el tratamiento, estabilización y valorización de residuos o subproductos orgánicos
ES2484069B1 (es) * 2013-02-08 2015-09-08 Asociación De Investigación De Industrias De La Construcción Aidico - Instituto Tecnológico De La Construcción Equipo separador de materiales
US8973491B1 (en) * 2013-03-15 2015-03-10 Sustainable Alternative Feed Enterprises System for processing primary food product waste into secondary food product
WO2014155393A1 (en) * 2013-03-25 2014-10-02 Pathak Manoj Systems and methods for collecting, processing, and discarding a plurality of rejects products and producing a plurality of recycled / reprocessed products therefrom
ITMI20131732A1 (it) * 2013-10-17 2015-04-18 Ambiente E Nutrizione Srl Procedimento di nobilitazione di polveri di scarto da cave minerarie, contenenti ossidi di ferro
DK3114940T3 (en) * 2015-07-08 2018-05-14 Odc Lizenz Ag CHOCOLATE, CHOCOLATE-SIMILAR PRODUCTS, CHOCOLATE MAKING KITS, AND METHODS FOR PRODUCING THE SAME
HUE052943T2 (hu) 2015-07-08 2021-05-28 Odc Lizenz Ag Kakaóporok és csokoládé
CN106540947A (zh) * 2015-09-18 2017-03-29 安宾特营养食品有限责任公司 食物废物或有机废物的处理方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2311884A1 (en) 2009-10-16 2011-04-20 Vommchemipharma S.R.L. Process for the production of cationic starch
US9981884B2 (en) * 2013-09-11 2018-05-29 Afyren Method for preserving the fermentable potential of an organic substrate and corresponding facility

Also Published As

Publication number Publication date
ITMI960579A1 (it) 1997-09-22
EP0796832A1 (en) 1997-09-24
DE69701761D1 (de) 2000-05-31
CA2200652A1 (en) 1997-09-22
CA2200652C (en) 2005-05-24
ES2147964T3 (es) 2000-10-01
ATE192129T1 (de) 2000-05-15
ITMI960579A0 (enrdf_load_stackoverflow) 1996-03-22
DE69701761T2 (de) 2000-11-23
IT1283297B1 (it) 1998-04-16
US5906793A (en) 1999-05-25

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